We haven't heard much from the world of the late Michael Jackson lately and, frankly, we were getting a little worried that they all went off and got real jobs or something.

Negative. Jackson's former dermatologist, Dr. Arnold Klein, put himself back on the pop culture map this week, hinting that he's the biological father of Jackson's 15-year-old son, Prince Michael.

Though Michael Jackson claimed he fathered all three of his children, there have always been rumors that he used a sperm donor. TMZ reported that Klein posted a "cryptic photo" on his Facebook page on Jan. 17, showing a side-by-side comparison of Prince Michael and Klein when he was younger, and wrote "hmmmmm."

And -- just to be fair -- the resemblance is pretty remarkable.

So, in other words, perhaps Arnold Klein is suggesting that he's really a woman and gave birth to Michael Jackson's child.

"To the best of my knowledge, I am not the father of these children. I can't answer it in any other way. I don't want to feed any of this insanity that is going around."

To the best of his knowledge? What ... did a bunch of his sperm go missing?

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Klein was rumored to have fathered Jackson's eldest son and his daughter Paris, because Jackson met his ex-wife Debbie Rowe (who would give birth to his two oldest children) when she worked for Klein at his office.

The paternity of Jackson's youngest child Blanket has also been a mystery, as he was born by an anonymous surrogate in 2002, and in April 2012 the singer's former bodyguard Matt Fiddes publicly announced that he was the boy's biological father, but his claims have not been confirmed.